Service Desk - Errors on Message Sent to SAP - Diagnostics

Inspired on that treat http://scn.sap.com/thread/3354028 i just update a blog post for share own diagnostics in send to sap errors

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Check to follow if you found erorr "message can't be sent to SAP"

1. the user that has create the message/operation is not maintained on AISUSER table
2. the sap customer number that send the message is not really a customer from your VAR, check with sap contracts department
3. check RFC SAPOSS connection
4. the user is not update as BUP003 con BP
5. the maintenance agreement of the customer is not up-to-date with SAP
6. chec autorizations on sap marketplace
7. the system for that message has been creates is not on marketplace or product is not installation relevant like AFARIA or SyBase

Regards,

Luis